mainwindow.cpp

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#include <QtGui>
#include <QLabel>

#include "mainwindow.h"
#include "diagramitem.h"
#include "diagramscene.h"
#include "diagramtextitem.h"

const int InsertTextButton = 10;

//! [0]
MainWindow::MainWindow()
{
    createActions();
    createToolBox();
    createMenus();

    scene = new DiagramScene(itemMenu);
    scene->setSceneRect(QRectF(0, 0, 5000, 5000));
    connect(scene, SIGNAL(itemInserted(DiagramItem *)),
            this, SLOT(itemInserted(DiagramItem *)));
    connect(scene, SIGNAL(textInserted(QGraphicsTextItem *)),
        this, SLOT(textInserted(QGraphicsTextItem *)));
    connect(scene, SIGNAL(itemSelected(QGraphicsItem *)),
        this, SLOT(itemSelected(QGraphicsItem *)));
    createToolbars();

    QHBoxLayout *layout = new QHBoxLayout;
    layout->addWidget(toolBox);
    view = new QGraphicsView(scene);
    layout->addWidget(view);

    QWidget *widget = new QWidget;
    widget->setLayout(layout);

    setCentralWidget(widget);
    setWindowTitle(tr("Diagramscene"));
}
//! [0]

//! [1]
void MainWindow::backgroundButtonGroupClicked(QAbstractButton *button)
{
    QList<QAbstractButton *> buttons = backgroundButtonGroup->buttons();
    foreach (QAbstractButton *myButton, buttons) {
    if (myButton != button)
        button->setChecked(false);
    }
    QString text = button->text();
    if (text == tr("Blue Grid"))
        scene->setBackgroundBrush(QPixmap(":/images/background1.png"));
    else if (text == tr("White Grid"))
        scene->setBackgroundBrush(QPixmap(":/images/background2.png"));
    else if (text == tr("Gray Grid"))
        scene->setBackgroundBrush(QPixmap(":/images/background3.png"));
    else
        scene->setBackgroundBrush(QPixmap(":/images/background4.png"));

    scene->update();
    view->update();
}
//! [1]

//! [2]
void MainWindow::buttonGroupClicked(int id)
{
    QList<QAbstractButton *> buttons = buttonGroup->buttons();
    foreach (QAbstractButton *button, buttons) {
    if (buttonGroup->button(id) != button)
        button->setChecked(false);
    }
    if (id == InsertTextButton) {
        scene->setMode(DiagramScene::InsertText);
    } else {
        scene->setItemType(DiagramItem::DiagramType(id));
        scene->setMode(DiagramScene::InsertItem);
    }
}
//! [2]

//! [3]
void MainWindow::deleteItem()
{
    foreach (QGraphicsItem *item, scene->selectedItems()) {
        if (item->type() == DiagramItem::Type) {
            qgraphicsitem_cast<DiagramItem *>(item)->removeArrows();
        }
        scene->removeItem(item);
    }
}
//! [3]

//! [4]
void MainWindow::pointerGroupClicked(int)
{
    scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
}
//! [4]

//! [5]
void MainWindow::bringToFront()
{
    if (scene->selectedItems().isEmpty())
        return;

    QGraphicsItem *selectedItem = scene->selectedItems().first();
    QList<QGraphicsItem *> overlapItems = selectedItem->collidingItems();

    qreal zValue = 0;
    foreach (QGraphicsItem *item, overlapItems) {
        if (item->zValue() >= zValue &&
            item->type() == DiagramItem::Type)
            zValue = item->zValue() + 0.1;
    }
    selectedItem->setZValue(zValue);
}
//! [5]

//! [6]
void MainWindow::sendToBack()
{
    if (scene->selectedItems().isEmpty())
        return;

    QGraphicsItem *selectedItem = scene->selectedItems().first();
    QList<QGraphicsItem *> overlapItems = selectedItem->collidingItems();

    qreal zValue = 0;
    foreach (QGraphicsItem *item, overlapItems) {
        if (item->zValue() <= zValue &&
            item->type() == DiagramItem::Type)
            zValue = item->zValue() - 0.1;
    }
    selectedItem->setZValue(zValue);
}
//! [6]

//! [7]
void MainWindow::itemInserted(DiagramItem *item)
{
    scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
    buttonGroup->button(int(item->diagramType()))->setChecked(false);
}
//! [7]

//! [8]
void MainWindow::textInserted(QGraphicsTextItem *)
{
    buttonGroup->button(InsertTextButton)->setChecked(false);
    scene->setMode(DiagramScene::Mode(pointerTypeGroup->checkedId()));
}
//! [8]

//! [9]
void MainWindow::currentFontChanged(const QFont &)
{
    handleFontChange();
}
//! [9]

//! [10]
void MainWindow::fontSizeChanged(const QString &)
{
    handleFontChange();
}
//! [10]

//! [11]
void MainWindow::sceneScaleChanged(const QString &scale)
{
    double newScale = scale.left(scale.indexOf(tr("%"))).toDouble() / 100.0;
    QMatrix oldMatrix = view->matrix();
    view->resetMatrix();
    view->translate(oldMatrix.dx(), oldMatrix.dy());
    view->scale(newScale, newScale);
}
//! [11]

//! [12]
void MainWindow::textColorChanged()
{
    textAction = qobject_cast<QAction *>(sender());
    fontColorToolButton->setIcon(createColorToolButtonIcon(
                ":/images/textpointer.png",
                qVariantValue<QColor>(textAction->data())));
    textButtonTriggered();
}
//! [12]

//! [13]
void MainWindow::itemColorChanged()
{
    fillAction = qobject_cast<QAction *>(sender());
    fillColorToolButton->setIcon(createColorToolButtonIcon(
                 ":/images/floodfill.png",
                 qVariantValue<QColor>(fillAction->data())));
    fillButtonTriggered();
}
//! [13]

//! [14]
void MainWindow::lineColorChanged()
{
    lineAction = qobject_cast<QAction *>(sender());
    lineColorToolButton->setIcon(createColorToolButtonIcon(
                 ":/images/linecolor.png",
                 qVariantValue<QColor>(lineAction->data())));
    lineButtonTriggered();
}
//! [14]

//! [15]
void MainWindow::textButtonTriggered()
{
    scene->setTextColor(qVariantValue<QColor>(textAction->data()));
}
//! [15]

//! [16]
void MainWindow::fillButtonTriggered()
{
    scene->setItemColor(qVariantValue<QColor>(fillAction->data()));
}
//! [16]

//! [17]
void MainWindow::lineButtonTriggered()
{
    scene->setLineColor(qVariantValue<QColor>(lineAction->data()));
}
//! [17]

//! [18]
void MainWindow::handleFontChange()
{
    QFont font = fontCombo->currentFont();
    font.setPointSize(fontSizeCombo->currentText().toInt());
    font.setWeight(boldAction->isChecked() ? QFont::Bold : QFont::Normal);
    font.setItalic(italicAction->isChecked());
    font.setUnderline(underlineAction->isChecked());

    scene->setFont(font);
}
//! [18]

//! [19]
void MainWindow::itemSelected(QGraphicsItem *item)
{
    DiagramTextItem *textItem =
    qgraphicsitem_cast<DiagramTextItem *>(item);

    QFont font = textItem->font();
    QColor color = textItem->defaultTextColor();
    fontCombo->setCurrentFont(font);
    fontSizeCombo->setEditText(QString().setNum(font.pointSize()));
    boldAction->setChecked(font.weight() == QFont::Bold);
    italicAction->setChecked(font.italic());
    underlineAction->setChecked(font.underline());
}
//! [19]

//! [20]
void MainWindow::about()
{
    QMessageBox::about(this, tr("About Diagram Scene"),
                       tr("The <b>Diagram Scene</b> example shows "
                          "use of the graphics framework."));
}
//! [20]

//! [21]
void MainWindow::createToolBox()
{
    buttonGroup = new QButtonGroup;
    buttonGroup->setExclusive(false);
    connect(buttonGroup, SIGNAL(buttonClicked(int)),
            this, SLOT(buttonGroupClicked(int)));
    QGridLayout *layout = new QGridLayout;
    layout->addWidget(createCellWidget(tr("Conditional"),
                               DiagramItem::Conditional), 0, 0);
    layout->addWidget(createCellWidget(tr("Process"),
                      DiagramItem::Step),0, 1);
    layout->addWidget(createCellWidget(tr("Input/Output"),
                      DiagramItem::Io), 1, 0);